Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/rtsock.c
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1 /*- 2 * Copyright (c) 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95 30 * $FreeBSD: releng/6.1/sys/net/rtsock.c 157504 2006-04-04 20:07:23Z andre $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/domain.h> 35 #include <sys/kernel.h> 36 #include <sys/jail.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/proc.h> 40 #include <sys/protosw.h> 41 #include <sys/signalvar.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/sysctl.h> 45 #include <sys/systm.h> 46 47 #include <net/if.h> 48 #include <net/netisr.h> 49 #include <net/raw_cb.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 54 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 55 56 /* NB: these are not modified */ 57 static struct sockaddr route_dst = { 2, PF_ROUTE, }; 58 static struct sockaddr route_src = { 2, PF_ROUTE, }; 59 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, }; 60 61 static struct { 62 int ip_count; /* attached w/ AF_INET */ 63 int ip6_count; /* attached w/ AF_INET6 */ 64 int ipx_count; /* attached w/ AF_IPX */ 65 int any_count; /* total attached */ 66 } route_cb; 67 68 struct mtx rtsock_mtx; 69 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF); 70 71 #define RTSOCK_LOCK() mtx_lock(&rtsock_mtx) 72 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx) 73 #define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED) 74 75 static struct ifqueue rtsintrq; 76 77 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, ""); 78 SYSCTL_INT(_net_route, OID_AUTO, netisr_maxqlen, CTLFLAG_RW, 79 &rtsintrq.ifq_maxlen, 0, "maximum routing socket dispatch queue length"); 80 81 struct walkarg { 82 int w_tmemsize; 83 int w_op, w_arg; 84 caddr_t w_tmem; 85 struct sysctl_req *w_req; 86 }; 87 88 static void rts_input(struct mbuf *m); 89 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo); 90 static int rt_msg2(int type, struct rt_addrinfo *rtinfo, 91 caddr_t cp, struct walkarg *w); 92 static int rt_xaddrs(caddr_t cp, caddr_t cplim, 93 struct rt_addrinfo *rtinfo); 94 static int sysctl_dumpentry(struct radix_node *rn, void *vw); 95 static int sysctl_iflist(int af, struct walkarg *w); 96 static int sysctl_ifmalist(int af, struct walkarg *w); 97 static int route_output(struct mbuf *m, struct socket *so); 98 static void rt_setmetrics(u_long which, const struct rt_metrics *in, 99 struct rt_metrics_lite *out); 100 static void rt_getmetrics(const struct rt_metrics_lite *in, 101 struct rt_metrics *out); 102 static void rt_dispatch(struct mbuf *, const struct sockaddr *); 103 104 static void 105 rts_init(void) 106 { 107 int tmp; 108 109 rtsintrq.ifq_maxlen = 256; 110 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp)) 111 rtsintrq.ifq_maxlen = tmp; 112 mtx_init(&rtsintrq.ifq_mtx, "rts_inq", NULL, MTX_DEF); 113 netisr_register(NETISR_ROUTE, rts_input, &rtsintrq, NETISR_MPSAFE); 114 } 115 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0) 116 117 static void 118 rts_input(struct mbuf *m) 119 { 120 struct sockproto route_proto; 121 unsigned short *family; 122 struct m_tag *tag; 123 124 route_proto.sp_family = PF_ROUTE; 125 tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL); 126 if (tag != NULL) { 127 family = (unsigned short *)(tag + 1); 128 route_proto.sp_protocol = *family; 129 m_tag_delete(m, tag); 130 } else 131 route_proto.sp_protocol = 0; 132 133 raw_input(m, &route_proto, &route_src, &route_dst); 134 } 135 136 /* 137 * It really doesn't make any sense at all for this code to share much 138 * with raw_usrreq.c, since its functionality is so restricted. XXX 139 */ 140 static int 141 rts_abort(struct socket *so) 142 { 143 144 return (raw_usrreqs.pru_abort(so)); 145 } 146 147 /* pru_accept is EOPNOTSUPP */ 148 149 static int 150 rts_attach(struct socket *so, int proto, struct thread *td) 151 { 152 struct rawcb *rp; 153 int s, error; 154 155 if (sotorawcb(so) != NULL) 156 return EISCONN; /* XXX panic? */ 157 /* XXX */ 158 MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO); 159 if (rp == NULL) 160 return ENOBUFS; 161 162 /* 163 * The splnet() is necessary to block protocols from sending 164 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 165 * this PCB is extant but incompletely initialized. 166 * Probably we should try to do more of this work beforehand and 167 * eliminate the spl. 168 */ 169 s = splnet(); 170 so->so_pcb = (caddr_t)rp; 171 error = raw_attach(so, proto); 172 rp = sotorawcb(so); 173 if (error) { 174 splx(s); 175 so->so_pcb = NULL; 176 free(rp, M_PCB); 177 return error; 178 } 179 RTSOCK_LOCK(); 180 switch(rp->rcb_proto.sp_protocol) { 181 case AF_INET: 182 route_cb.ip_count++; 183 break; 184 case AF_INET6: 185 route_cb.ip6_count++; 186 break; 187 case AF_IPX: 188 route_cb.ipx_count++; 189 break; 190 } 191 rp->rcb_faddr = &route_src; 192 route_cb.any_count++; 193 RTSOCK_UNLOCK(); 194 soisconnected(so); 195 so->so_options |= SO_USELOOPBACK; 196 splx(s); 197 return 0; 198 } 199 200 static int 201 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 202 { 203 204 return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */ 205 } 206 207 static int 208 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 209 { 210 211 return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */ 212 } 213 214 /* pru_connect2 is EOPNOTSUPP */ 215 /* pru_control is EOPNOTSUPP */ 216 217 static int 218 rts_detach(struct socket *so) 219 { 220 struct rawcb *rp = sotorawcb(so); 221 int s, error; 222 223 s = splnet(); 224 if (rp != NULL) { 225 RTSOCK_LOCK(); 226 switch(rp->rcb_proto.sp_protocol) { 227 case AF_INET: 228 route_cb.ip_count--; 229 break; 230 case AF_INET6: 231 route_cb.ip6_count--; 232 break; 233 case AF_IPX: 234 route_cb.ipx_count--; 235 break; 236 } 237 route_cb.any_count--; 238 RTSOCK_UNLOCK(); 239 } 240 error = raw_usrreqs.pru_detach(so); 241 splx(s); 242 return error; 243 } 244 245 static int 246 rts_disconnect(struct socket *so) 247 { 248 249 return (raw_usrreqs.pru_disconnect(so)); 250 } 251 252 /* pru_listen is EOPNOTSUPP */ 253 254 static int 255 rts_peeraddr(struct socket *so, struct sockaddr **nam) 256 { 257 258 return (raw_usrreqs.pru_peeraddr(so, nam)); 259 } 260 261 /* pru_rcvd is EOPNOTSUPP */ 262 /* pru_rcvoob is EOPNOTSUPP */ 263 264 static int 265 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 266 struct mbuf *control, struct thread *td) 267 { 268 269 return (raw_usrreqs.pru_send(so, flags, m, nam, control, td)); 270 } 271 272 /* pru_sense is null */ 273 274 static int 275 rts_shutdown(struct socket *so) 276 { 277 278 return (raw_usrreqs.pru_shutdown(so)); 279 } 280 281 static int 282 rts_sockaddr(struct socket *so, struct sockaddr **nam) 283 { 284 285 return (raw_usrreqs.pru_sockaddr(so, nam)); 286 } 287 288 static struct pr_usrreqs route_usrreqs = { 289 .pru_abort = rts_abort, 290 .pru_attach = rts_attach, 291 .pru_bind = rts_bind, 292 .pru_connect = rts_connect, 293 .pru_detach = rts_detach, 294 .pru_disconnect = rts_disconnect, 295 .pru_peeraddr = rts_peeraddr, 296 .pru_send = rts_send, 297 .pru_shutdown = rts_shutdown, 298 .pru_sockaddr = rts_sockaddr, 299 }; 300 301 /*ARGSUSED*/ 302 static int 303 route_output(struct mbuf *m, struct socket *so) 304 { 305 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0) 306 struct rt_msghdr *rtm = NULL; 307 struct rtentry *rt = NULL; 308 struct radix_node_head *rnh; 309 struct rt_addrinfo info; 310 int len, error = 0; 311 struct ifnet *ifp = NULL; 312 struct ifaddr *ifa = NULL; 313 struct sockaddr_in jail; 314 315 #define senderr(e) { error = e; goto flush;} 316 if (m == NULL || ((m->m_len < sizeof(long)) && 317 (m = m_pullup(m, sizeof(long))) == NULL)) 318 return (ENOBUFS); 319 if ((m->m_flags & M_PKTHDR) == 0) 320 panic("route_output"); 321 len = m->m_pkthdr.len; 322 if (len < sizeof(*rtm) || 323 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 324 info.rti_info[RTAX_DST] = NULL; 325 senderr(EINVAL); 326 } 327 R_Malloc(rtm, struct rt_msghdr *, len); 328 if (rtm == NULL) { 329 info.rti_info[RTAX_DST] = NULL; 330 senderr(ENOBUFS); 331 } 332 m_copydata(m, 0, len, (caddr_t)rtm); 333 if (rtm->rtm_version != RTM_VERSION) { 334 info.rti_info[RTAX_DST] = NULL; 335 senderr(EPROTONOSUPPORT); 336 } 337 rtm->rtm_pid = curproc->p_pid; 338 bzero(&info, sizeof(info)); 339 info.rti_addrs = rtm->rtm_addrs; 340 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) { 341 info.rti_info[RTAX_DST] = NULL; 342 senderr(EINVAL); 343 } 344 info.rti_flags = rtm->rtm_flags; 345 if (info.rti_info[RTAX_DST] == NULL || 346 info.rti_info[RTAX_DST]->sa_family >= AF_MAX || 347 (info.rti_info[RTAX_GATEWAY] != NULL && 348 info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) 349 senderr(EINVAL); 350 if (info.rti_info[RTAX_GENMASK]) { 351 struct radix_node *t; 352 t = rn_addmask((caddr_t) info.rti_info[RTAX_GENMASK], 0, 1); 353 if (t != NULL && 354 bcmp((char *)(void *)info.rti_info[RTAX_GENMASK] + 1, 355 (char *)(void *)t->rn_key + 1, 356 ((struct sockaddr *)t->rn_key)->sa_len - 1) == 0) 357 info.rti_info[RTAX_GENMASK] = 358 (struct sockaddr *)t->rn_key; 359 else 360 senderr(ENOBUFS); 361 } 362 363 /* 364 * Verify that the caller has the appropriate privilege; RTM_GET 365 * is the only operation the non-superuser is allowed. 366 */ 367 if (rtm->rtm_type != RTM_GET && (error = suser(curthread)) != 0) 368 senderr(error); 369 370 switch (rtm->rtm_type) { 371 struct rtentry *saved_nrt; 372 373 case RTM_ADD: 374 if (info.rti_info[RTAX_GATEWAY] == NULL) 375 senderr(EINVAL); 376 saved_nrt = NULL; 377 error = rtrequest1(RTM_ADD, &info, &saved_nrt); 378 if (error == 0 && saved_nrt) { 379 RT_LOCK(saved_nrt); 380 rt_setmetrics(rtm->rtm_inits, 381 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 382 rtm->rtm_index = saved_nrt->rt_ifp->if_index; 383 RT_REMREF(saved_nrt); 384 saved_nrt->rt_genmask = info.rti_info[RTAX_GENMASK]; 385 RT_UNLOCK(saved_nrt); 386 } 387 break; 388 389 case RTM_DELETE: 390 saved_nrt = NULL; 391 error = rtrequest1(RTM_DELETE, &info, &saved_nrt); 392 if (error == 0) { 393 RT_LOCK(saved_nrt); 394 rt = saved_nrt; 395 goto report; 396 } 397 break; 398 399 case RTM_GET: 400 case RTM_CHANGE: 401 case RTM_LOCK: 402 rnh = rt_tables[info.rti_info[RTAX_DST]->sa_family]; 403 if (rnh == NULL) 404 senderr(EAFNOSUPPORT); 405 RADIX_NODE_HEAD_LOCK(rnh); 406 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST], 407 info.rti_info[RTAX_NETMASK], rnh); 408 if (rt == NULL) { /* XXX looks bogus */ 409 RADIX_NODE_HEAD_UNLOCK(rnh); 410 senderr(ESRCH); 411 } 412 RT_LOCK(rt); 413 RT_ADDREF(rt); 414 RADIX_NODE_HEAD_UNLOCK(rnh); 415 416 switch(rtm->rtm_type) { 417 418 case RTM_GET: 419 report: 420 RT_LOCK_ASSERT(rt); 421 info.rti_info[RTAX_DST] = rt_key(rt); 422 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 423 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 424 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 425 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 426 ifp = rt->rt_ifp; 427 if (ifp) { 428 info.rti_info[RTAX_IFP] = 429 ifaddr_byindex(ifp->if_index)->ifa_addr; 430 if (jailed(so->so_cred)) { 431 bzero(&jail, sizeof(jail)); 432 jail.sin_family = PF_INET; 433 jail.sin_len = sizeof(jail); 434 jail.sin_addr.s_addr = 435 htonl(prison_getip(so->so_cred)); 436 info.rti_info[RTAX_IFA] = 437 (struct sockaddr *)&jail; 438 } else 439 info.rti_info[RTAX_IFA] = 440 rt->rt_ifa->ifa_addr; 441 if (ifp->if_flags & IFF_POINTOPOINT) 442 info.rti_info[RTAX_BRD] = 443 rt->rt_ifa->ifa_dstaddr; 444 rtm->rtm_index = ifp->if_index; 445 } else { 446 info.rti_info[RTAX_IFP] = NULL; 447 info.rti_info[RTAX_IFA] = NULL; 448 } 449 } else if ((ifp = rt->rt_ifp) != NULL) { 450 rtm->rtm_index = ifp->if_index; 451 } 452 len = rt_msg2(rtm->rtm_type, &info, NULL, NULL); 453 if (len > rtm->rtm_msglen) { 454 struct rt_msghdr *new_rtm; 455 R_Malloc(new_rtm, struct rt_msghdr *, len); 456 if (new_rtm == NULL) { 457 RT_UNLOCK(rt); 458 senderr(ENOBUFS); 459 } 460 bcopy(rtm, new_rtm, rtm->rtm_msglen); 461 Free(rtm); rtm = new_rtm; 462 } 463 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL); 464 rtm->rtm_flags = rt->rt_flags; 465 rtm->rtm_use = 0; 466 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 467 rtm->rtm_addrs = info.rti_addrs; 468 break; 469 470 case RTM_CHANGE: 471 /* 472 * New gateway could require new ifaddr, ifp; 473 * flags may also be different; ifp may be specified 474 * by ll sockaddr when protocol address is ambiguous 475 */ 476 if (((rt->rt_flags & RTF_GATEWAY) && 477 info.rti_info[RTAX_GATEWAY] != NULL) || 478 info.rti_info[RTAX_IFP] != NULL || 479 (info.rti_info[RTAX_IFA] != NULL && 480 !sa_equal(info.rti_info[RTAX_IFA], 481 rt->rt_ifa->ifa_addr))) { 482 RT_UNLOCK(rt); 483 if ((error = rt_getifa(&info)) != 0) 484 senderr(error); 485 RT_LOCK(rt); 486 } 487 if (info.rti_info[RTAX_GATEWAY] != NULL && 488 (error = rt_setgate(rt, rt_key(rt), 489 info.rti_info[RTAX_GATEWAY])) != 0) { 490 RT_UNLOCK(rt); 491 senderr(error); 492 } 493 if ((ifa = info.rti_ifa) != NULL) { 494 struct ifaddr *oifa = rt->rt_ifa; 495 if (oifa != ifa) { 496 if (oifa) { 497 if (oifa->ifa_rtrequest) 498 oifa->ifa_rtrequest( 499 RTM_DELETE, rt, 500 &info); 501 IFAFREE(oifa); 502 } 503 IFAREF(ifa); 504 rt->rt_ifa = ifa; 505 rt->rt_ifp = info.rti_ifp; 506 } 507 } 508 /* Allow some flags to be toggled on change. */ 509 if (rtm->rtm_fmask & RTF_FMASK) 510 rt->rt_flags = (rt->rt_flags & 511 ~rtm->rtm_fmask) | 512 (rtm->rtm_flags & rtm->rtm_fmask); 513 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 514 &rt->rt_rmx); 515 rtm->rtm_index = rt->rt_ifp->if_index; 516 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 517 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 518 if (info.rti_info[RTAX_GENMASK]) 519 rt->rt_genmask = info.rti_info[RTAX_GENMASK]; 520 /* FALLTHROUGH */ 521 case RTM_LOCK: 522 /* We don't support locks anymore */ 523 break; 524 } 525 RT_UNLOCK(rt); 526 break; 527 528 default: 529 senderr(EOPNOTSUPP); 530 } 531 532 flush: 533 if (rtm) { 534 if (error) 535 rtm->rtm_errno = error; 536 else 537 rtm->rtm_flags |= RTF_DONE; 538 } 539 if (rt) /* XXX can this be true? */ 540 RTFREE(rt); 541 { 542 struct rawcb *rp = NULL; 543 /* 544 * Check to see if we don't want our own messages. 545 */ 546 if ((so->so_options & SO_USELOOPBACK) == 0) { 547 if (route_cb.any_count <= 1) { 548 if (rtm) 549 Free(rtm); 550 m_freem(m); 551 return (error); 552 } 553 /* There is another listener, so construct message */ 554 rp = sotorawcb(so); 555 } 556 if (rtm) { 557 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 558 if (m->m_pkthdr.len < rtm->rtm_msglen) { 559 m_freem(m); 560 m = NULL; 561 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 562 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 563 Free(rtm); 564 } 565 if (m) { 566 if (rp) { 567 /* 568 * XXX insure we don't get a copy by 569 * invalidating our protocol 570 */ 571 unsigned short family = rp->rcb_proto.sp_family; 572 rp->rcb_proto.sp_family = 0; 573 rt_dispatch(m, info.rti_info[RTAX_DST]); 574 rp->rcb_proto.sp_family = family; 575 } else 576 rt_dispatch(m, info.rti_info[RTAX_DST]); 577 } 578 } 579 return (error); 580 #undef sa_equal 581 } 582 583 static void 584 rt_setmetrics(u_long which, const struct rt_metrics *in, 585 struct rt_metrics_lite *out) 586 { 587 #define metric(f, e) if (which & (f)) out->e = in->e; 588 /* 589 * Only these are stored in the routing entry since introduction 590 * of tcp hostcache. The rest is ignored. 591 */ 592 metric(RTV_MTU, rmx_mtu); 593 metric(RTV_EXPIRE, rmx_expire); 594 #undef metric 595 } 596 597 static void 598 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out) 599 { 600 #define metric(e) out->e = in->e; 601 bzero(out, sizeof(*out)); 602 metric(rmx_mtu); 603 metric(rmx_expire); 604 #undef metric 605 } 606 607 /* 608 * Extract the addresses of the passed sockaddrs. 609 * Do a little sanity checking so as to avoid bad memory references. 610 * This data is derived straight from userland. 611 */ 612 static int 613 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 614 { 615 struct sockaddr *sa; 616 int i; 617 618 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 619 if ((rtinfo->rti_addrs & (1 << i)) == 0) 620 continue; 621 sa = (struct sockaddr *)cp; 622 /* 623 * It won't fit. 624 */ 625 if (cp + sa->sa_len > cplim) 626 return (EINVAL); 627 /* 628 * there are no more.. quit now 629 * If there are more bits, they are in error. 630 * I've seen this. route(1) can evidently generate these. 631 * This causes kernel to core dump. 632 * for compatibility, If we see this, point to a safe address. 633 */ 634 if (sa->sa_len == 0) { 635 rtinfo->rti_info[i] = &sa_zero; 636 return (0); /* should be EINVAL but for compat */ 637 } 638 /* accept it */ 639 rtinfo->rti_info[i] = sa; 640 cp += SA_SIZE(sa); 641 } 642 return (0); 643 } 644 645 static struct mbuf * 646 rt_msg1(int type, struct rt_addrinfo *rtinfo) 647 { 648 struct rt_msghdr *rtm; 649 struct mbuf *m; 650 int i; 651 struct sockaddr *sa; 652 int len, dlen; 653 654 switch (type) { 655 656 case RTM_DELADDR: 657 case RTM_NEWADDR: 658 len = sizeof(struct ifa_msghdr); 659 break; 660 661 case RTM_DELMADDR: 662 case RTM_NEWMADDR: 663 len = sizeof(struct ifma_msghdr); 664 break; 665 666 case RTM_IFINFO: 667 len = sizeof(struct if_msghdr); 668 break; 669 670 case RTM_IFANNOUNCE: 671 case RTM_IEEE80211: 672 len = sizeof(struct if_announcemsghdr); 673 break; 674 675 default: 676 len = sizeof(struct rt_msghdr); 677 } 678 if (len > MCLBYTES) 679 panic("rt_msg1"); 680 m = m_gethdr(M_DONTWAIT, MT_DATA); 681 if (m && len > MHLEN) { 682 MCLGET(m, M_DONTWAIT); 683 if ((m->m_flags & M_EXT) == 0) { 684 m_free(m); 685 m = NULL; 686 } 687 } 688 if (m == NULL) 689 return (m); 690 m->m_pkthdr.len = m->m_len = len; 691 m->m_pkthdr.rcvif = NULL; 692 rtm = mtod(m, struct rt_msghdr *); 693 bzero((caddr_t)rtm, len); 694 for (i = 0; i < RTAX_MAX; i++) { 695 if ((sa = rtinfo->rti_info[i]) == NULL) 696 continue; 697 rtinfo->rti_addrs |= (1 << i); 698 dlen = SA_SIZE(sa); 699 m_copyback(m, len, dlen, (caddr_t)sa); 700 len += dlen; 701 } 702 if (m->m_pkthdr.len != len) { 703 m_freem(m); 704 return (NULL); 705 } 706 rtm->rtm_msglen = len; 707 rtm->rtm_version = RTM_VERSION; 708 rtm->rtm_type = type; 709 return (m); 710 } 711 712 static int 713 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w) 714 { 715 int i; 716 int len, dlen, second_time = 0; 717 caddr_t cp0; 718 719 rtinfo->rti_addrs = 0; 720 again: 721 switch (type) { 722 723 case RTM_DELADDR: 724 case RTM_NEWADDR: 725 len = sizeof(struct ifa_msghdr); 726 break; 727 728 case RTM_IFINFO: 729 len = sizeof(struct if_msghdr); 730 break; 731 732 case RTM_NEWMADDR: 733 len = sizeof(struct ifma_msghdr); 734 break; 735 736 default: 737 len = sizeof(struct rt_msghdr); 738 } 739 cp0 = cp; 740 if (cp0) 741 cp += len; 742 for (i = 0; i < RTAX_MAX; i++) { 743 struct sockaddr *sa; 744 745 if ((sa = rtinfo->rti_info[i]) == NULL) 746 continue; 747 rtinfo->rti_addrs |= (1 << i); 748 dlen = SA_SIZE(sa); 749 if (cp) { 750 bcopy((caddr_t)sa, cp, (unsigned)dlen); 751 cp += dlen; 752 } 753 len += dlen; 754 } 755 len = ALIGN(len); 756 if (cp == NULL && w != NULL && !second_time) { 757 struct walkarg *rw = w; 758 759 if (rw->w_req) { 760 if (rw->w_tmemsize < len) { 761 if (rw->w_tmem) 762 free(rw->w_tmem, M_RTABLE); 763 rw->w_tmem = (caddr_t) 764 malloc(len, M_RTABLE, M_NOWAIT); 765 if (rw->w_tmem) 766 rw->w_tmemsize = len; 767 } 768 if (rw->w_tmem) { 769 cp = rw->w_tmem; 770 second_time = 1; 771 goto again; 772 } 773 } 774 } 775 if (cp) { 776 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 777 778 rtm->rtm_version = RTM_VERSION; 779 rtm->rtm_type = type; 780 rtm->rtm_msglen = len; 781 } 782 return (len); 783 } 784 785 /* 786 * This routine is called to generate a message from the routing 787 * socket indicating that a redirect has occured, a routing lookup 788 * has failed, or that a protocol has detected timeouts to a particular 789 * destination. 790 */ 791 void 792 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error) 793 { 794 struct rt_msghdr *rtm; 795 struct mbuf *m; 796 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 797 798 if (route_cb.any_count == 0) 799 return; 800 m = rt_msg1(type, rtinfo); 801 if (m == NULL) 802 return; 803 rtm = mtod(m, struct rt_msghdr *); 804 rtm->rtm_flags = RTF_DONE | flags; 805 rtm->rtm_errno = error; 806 rtm->rtm_addrs = rtinfo->rti_addrs; 807 rt_dispatch(m, sa); 808 } 809 810 /* 811 * This routine is called to generate a message from the routing 812 * socket indicating that the status of a network interface has changed. 813 */ 814 void 815 rt_ifmsg(struct ifnet *ifp) 816 { 817 struct if_msghdr *ifm; 818 struct mbuf *m; 819 struct rt_addrinfo info; 820 821 if (route_cb.any_count == 0) 822 return; 823 bzero((caddr_t)&info, sizeof(info)); 824 m = rt_msg1(RTM_IFINFO, &info); 825 if (m == NULL) 826 return; 827 ifm = mtod(m, struct if_msghdr *); 828 ifm->ifm_index = ifp->if_index; 829 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 830 ifm->ifm_data = ifp->if_data; 831 ifm->ifm_addrs = 0; 832 rt_dispatch(m, NULL); 833 } 834 835 /* 836 * This is called to generate messages from the routing socket 837 * indicating a network interface has had addresses associated with it. 838 * if we ever reverse the logic and replace messages TO the routing 839 * socket indicate a request to configure interfaces, then it will 840 * be unnecessary as the routing socket will automatically generate 841 * copies of it. 842 */ 843 void 844 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt) 845 { 846 struct rt_addrinfo info; 847 struct sockaddr *sa = NULL; 848 int pass; 849 struct mbuf *m = NULL; 850 struct ifnet *ifp = ifa->ifa_ifp; 851 852 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 853 ("unexpected cmd %u", cmd)); 854 855 if (route_cb.any_count == 0) 856 return; 857 for (pass = 1; pass < 3; pass++) { 858 bzero((caddr_t)&info, sizeof(info)); 859 if ((cmd == RTM_ADD && pass == 1) || 860 (cmd == RTM_DELETE && pass == 2)) { 861 struct ifa_msghdr *ifam; 862 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 863 864 info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr; 865 info.rti_info[RTAX_IFP] = 866 ifaddr_byindex(ifp->if_index)->ifa_addr; 867 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 868 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 869 if ((m = rt_msg1(ncmd, &info)) == NULL) 870 continue; 871 ifam = mtod(m, struct ifa_msghdr *); 872 ifam->ifam_index = ifp->if_index; 873 ifam->ifam_metric = ifa->ifa_metric; 874 ifam->ifam_flags = ifa->ifa_flags; 875 ifam->ifam_addrs = info.rti_addrs; 876 } 877 if ((cmd == RTM_ADD && pass == 2) || 878 (cmd == RTM_DELETE && pass == 1)) { 879 struct rt_msghdr *rtm; 880 881 if (rt == NULL) 882 continue; 883 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 884 info.rti_info[RTAX_DST] = sa = rt_key(rt); 885 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 886 if ((m = rt_msg1(cmd, &info)) == NULL) 887 continue; 888 rtm = mtod(m, struct rt_msghdr *); 889 rtm->rtm_index = ifp->if_index; 890 rtm->rtm_flags |= rt->rt_flags; 891 rtm->rtm_errno = error; 892 rtm->rtm_addrs = info.rti_addrs; 893 } 894 rt_dispatch(m, sa); 895 } 896 } 897 898 /* 899 * This is the analogue to the rt_newaddrmsg which performs the same 900 * function but for multicast group memberhips. This is easier since 901 * there is no route state to worry about. 902 */ 903 void 904 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma) 905 { 906 struct rt_addrinfo info; 907 struct mbuf *m = NULL; 908 struct ifnet *ifp = ifma->ifma_ifp; 909 struct ifma_msghdr *ifmam; 910 911 if (route_cb.any_count == 0) 912 return; 913 914 bzero((caddr_t)&info, sizeof(info)); 915 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 916 info.rti_info[RTAX_IFP] = 917 ifp ? ifaddr_byindex(ifp->if_index)->ifa_addr : NULL; 918 /* 919 * If a link-layer address is present, present it as a ``gateway'' 920 * (similarly to how ARP entries, e.g., are presented). 921 */ 922 info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr; 923 m = rt_msg1(cmd, &info); 924 if (m == NULL) 925 return; 926 ifmam = mtod(m, struct ifma_msghdr *); 927 ifmam->ifmam_index = ifp->if_index; 928 ifmam->ifmam_addrs = info.rti_addrs; 929 rt_dispatch(m, ifma->ifma_addr); 930 } 931 932 static struct mbuf * 933 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what, 934 struct rt_addrinfo *info) 935 { 936 struct if_announcemsghdr *ifan; 937 struct mbuf *m; 938 939 if (route_cb.any_count == 0) 940 return NULL; 941 bzero((caddr_t)info, sizeof(*info)); 942 m = rt_msg1(type, info); 943 if (m != NULL) { 944 ifan = mtod(m, struct if_announcemsghdr *); 945 ifan->ifan_index = ifp->if_index; 946 strlcpy(ifan->ifan_name, ifp->if_xname, 947 sizeof(ifan->ifan_name)); 948 ifan->ifan_what = what; 949 } 950 return m; 951 } 952 953 /* 954 * This is called to generate routing socket messages indicating 955 * IEEE80211 wireless events. 956 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way. 957 */ 958 void 959 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len) 960 { 961 struct mbuf *m; 962 struct rt_addrinfo info; 963 964 m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info); 965 if (m != NULL) { 966 /* 967 * Append the ieee80211 data. Try to stick it in the 968 * mbuf containing the ifannounce msg; otherwise allocate 969 * a new mbuf and append. 970 * 971 * NB: we assume m is a single mbuf. 972 */ 973 if (data_len > M_TRAILINGSPACE(m)) { 974 struct mbuf *n = m_get(M_NOWAIT, MT_DATA); 975 if (n == NULL) { 976 m_freem(m); 977 return; 978 } 979 bcopy(data, mtod(n, void *), data_len); 980 n->m_len = data_len; 981 m->m_next = n; 982 } else if (data_len > 0) { 983 bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len); 984 m->m_len += data_len; 985 } 986 if (m->m_flags & M_PKTHDR) 987 m->m_pkthdr.len += data_len; 988 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len; 989 rt_dispatch(m, NULL); 990 } 991 } 992 993 /* 994 * This is called to generate routing socket messages indicating 995 * network interface arrival and departure. 996 */ 997 void 998 rt_ifannouncemsg(struct ifnet *ifp, int what) 999 { 1000 struct mbuf *m; 1001 struct rt_addrinfo info; 1002 1003 m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info); 1004 if (m != NULL) 1005 rt_dispatch(m, NULL); 1006 } 1007 1008 static void 1009 rt_dispatch(struct mbuf *m, const struct sockaddr *sa) 1010 { 1011 struct m_tag *tag; 1012 1013 /* 1014 * Preserve the family from the sockaddr, if any, in an m_tag for 1015 * use when injecting the mbuf into the routing socket buffer from 1016 * the netisr. 1017 */ 1018 if (sa != NULL) { 1019 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short), 1020 M_NOWAIT); 1021 if (tag == NULL) { 1022 m_freem(m); 1023 return; 1024 } 1025 *(unsigned short *)(tag + 1) = sa->sa_family; 1026 m_tag_prepend(m, tag); 1027 } 1028 netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */ 1029 } 1030 1031 /* 1032 * This is used in dumping the kernel table via sysctl(). 1033 */ 1034 static int 1035 sysctl_dumpentry(struct radix_node *rn, void *vw) 1036 { 1037 struct walkarg *w = vw; 1038 struct rtentry *rt = (struct rtentry *)rn; 1039 int error = 0, size; 1040 struct rt_addrinfo info; 1041 1042 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 1043 return 0; 1044 bzero((caddr_t)&info, sizeof(info)); 1045 info.rti_info[RTAX_DST] = rt_key(rt); 1046 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1047 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1048 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 1049 if (rt->rt_ifp) { 1050 info.rti_info[RTAX_IFP] = 1051 ifaddr_byindex(rt->rt_ifp->if_index)->ifa_addr; 1052 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 1053 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 1054 info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr; 1055 } 1056 size = rt_msg2(RTM_GET, &info, NULL, w); 1057 if (w->w_req && w->w_tmem) { 1058 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 1059 1060 rtm->rtm_flags = rt->rt_flags; 1061 rtm->rtm_use = rt->rt_rmx.rmx_pksent; 1062 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 1063 rtm->rtm_index = rt->rt_ifp->if_index; 1064 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 1065 rtm->rtm_addrs = info.rti_addrs; 1066 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 1067 return (error); 1068 } 1069 return (error); 1070 } 1071 1072 static int 1073 sysctl_iflist(int af, struct walkarg *w) 1074 { 1075 struct ifnet *ifp; 1076 struct ifaddr *ifa; 1077 struct rt_addrinfo info; 1078 int len, error = 0; 1079 1080 bzero((caddr_t)&info, sizeof(info)); 1081 IFNET_RLOCK(); 1082 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1083 if (w->w_arg && w->w_arg != ifp->if_index) 1084 continue; 1085 ifa = ifaddr_byindex(ifp->if_index); 1086 info.rti_info[RTAX_IFP] = ifa->ifa_addr; 1087 len = rt_msg2(RTM_IFINFO, &info, NULL, w); 1088 info.rti_info[RTAX_IFP] = NULL; 1089 if (w->w_req && w->w_tmem) { 1090 struct if_msghdr *ifm; 1091 1092 ifm = (struct if_msghdr *)w->w_tmem; 1093 ifm->ifm_index = ifp->if_index; 1094 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1095 ifm->ifm_data = ifp->if_data; 1096 ifm->ifm_addrs = info.rti_addrs; 1097 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 1098 if (error) 1099 goto done; 1100 } 1101 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) { 1102 if (af && af != ifa->ifa_addr->sa_family) 1103 continue; 1104 if (jailed(curthread->td_ucred) && 1105 prison_if(curthread->td_ucred, ifa->ifa_addr)) 1106 continue; 1107 info.rti_info[RTAX_IFA] = ifa->ifa_addr; 1108 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 1109 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 1110 len = rt_msg2(RTM_NEWADDR, &info, NULL, w); 1111 if (w->w_req && w->w_tmem) { 1112 struct ifa_msghdr *ifam; 1113 1114 ifam = (struct ifa_msghdr *)w->w_tmem; 1115 ifam->ifam_index = ifa->ifa_ifp->if_index; 1116 ifam->ifam_flags = ifa->ifa_flags; 1117 ifam->ifam_metric = ifa->ifa_metric; 1118 ifam->ifam_addrs = info.rti_addrs; 1119 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 1120 if (error) 1121 goto done; 1122 } 1123 } 1124 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] = 1125 info.rti_info[RTAX_BRD] = NULL; 1126 } 1127 done: 1128 IFNET_RUNLOCK(); 1129 return (error); 1130 } 1131 1132 int 1133 sysctl_ifmalist(int af, struct walkarg *w) 1134 { 1135 struct ifnet *ifp; 1136 struct ifmultiaddr *ifma; 1137 struct rt_addrinfo info; 1138 int len, error = 0; 1139 struct ifaddr *ifa; 1140 1141 bzero((caddr_t)&info, sizeof(info)); 1142 IFNET_RLOCK(); 1143 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1144 if (w->w_arg && w->w_arg != ifp->if_index) 1145 continue; 1146 ifa = ifaddr_byindex(ifp->if_index); 1147 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL; 1148 IF_ADDR_LOCK(ifp); 1149 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1150 if (af && af != ifma->ifma_addr->sa_family) 1151 continue; 1152 if (jailed(curproc->p_ucred) && 1153 prison_if(curproc->p_ucred, ifma->ifma_addr)) 1154 continue; 1155 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 1156 info.rti_info[RTAX_GATEWAY] = 1157 (ifma->ifma_addr->sa_family != AF_LINK) ? 1158 ifma->ifma_lladdr : NULL; 1159 len = rt_msg2(RTM_NEWMADDR, &info, NULL, w); 1160 if (w->w_req && w->w_tmem) { 1161 struct ifma_msghdr *ifmam; 1162 1163 ifmam = (struct ifma_msghdr *)w->w_tmem; 1164 ifmam->ifmam_index = ifma->ifma_ifp->if_index; 1165 ifmam->ifmam_flags = 0; 1166 ifmam->ifmam_addrs = info.rti_addrs; 1167 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 1168 if (error) { 1169 IF_ADDR_UNLOCK(ifp); 1170 goto done; 1171 } 1172 } 1173 } 1174 IF_ADDR_UNLOCK(ifp); 1175 } 1176 done: 1177 IFNET_RUNLOCK(); 1178 return (error); 1179 } 1180 1181 static int 1182 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 1183 { 1184 int *name = (int *)arg1; 1185 u_int namelen = arg2; 1186 struct radix_node_head *rnh; 1187 int i, lim, error = EINVAL; 1188 u_char af; 1189 struct walkarg w; 1190 1191 name ++; 1192 namelen--; 1193 if (req->newptr) 1194 return (EPERM); 1195 if (namelen != 3) 1196 return ((namelen < 3) ? EISDIR : ENOTDIR); 1197 af = name[0]; 1198 if (af > AF_MAX) 1199 return (EINVAL); 1200 bzero(&w, sizeof(w)); 1201 w.w_op = name[1]; 1202 w.w_arg = name[2]; 1203 w.w_req = req; 1204 1205 error = sysctl_wire_old_buffer(req, 0); 1206 if (error) 1207 return (error); 1208 switch (w.w_op) { 1209 1210 case NET_RT_DUMP: 1211 case NET_RT_FLAGS: 1212 if (af == 0) { /* dump all tables */ 1213 i = 1; 1214 lim = AF_MAX; 1215 } else /* dump only one table */ 1216 i = lim = af; 1217 for (error = 0; error == 0 && i <= lim; i++) 1218 if ((rnh = rt_tables[i]) != NULL) { 1219 RADIX_NODE_HEAD_LOCK(rnh); 1220 error = rnh->rnh_walktree(rnh, 1221 sysctl_dumpentry, &w); 1222 RADIX_NODE_HEAD_UNLOCK(rnh); 1223 } else if (af != 0) 1224 error = EAFNOSUPPORT; 1225 break; 1226 1227 case NET_RT_IFLIST: 1228 error = sysctl_iflist(af, &w); 1229 break; 1230 1231 case NET_RT_IFMALIST: 1232 error = sysctl_ifmalist(af, &w); 1233 break; 1234 } 1235 if (w.w_tmem) 1236 free(w.w_tmem, M_RTABLE); 1237 return (error); 1238 } 1239 1240 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1241 1242 /* 1243 * Definitions of protocols supported in the ROUTE domain. 1244 */ 1245 1246 extern struct domain routedomain; /* or at least forward */ 1247 1248 static struct protosw routesw[] = { 1249 { 1250 .pr_type = SOCK_RAW, 1251 .pr_domain = &routedomain, 1252 .pr_flags = PR_ATOMIC|PR_ADDR, 1253 .pr_output = route_output, 1254 .pr_ctlinput = raw_ctlinput, 1255 .pr_init = raw_init, 1256 .pr_usrreqs = &route_usrreqs 1257 } 1258 }; 1259 1260 static struct domain routedomain = { 1261 .dom_family = PF_ROUTE, 1262 .dom_name = "route", 1263 .dom_protosw = routesw, 1264 .dom_protoswNPROTOSW = &routesw[sizeof(routesw)/sizeof(routesw[0])] 1265 }; 1266 1267 DOMAIN_SET(route);
Cache object: 7e4192d5d37476321c4ac51175cc94fc
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